Formaldehyde is from the purification of the vaccine. 99.9% of which is removed. The reason it doesn’t give a dosage is the ammount is so minuscule that it can’t be measured without going into picograms. That’s one trillionth of a gram. You breathe in more formaldehyde by driving down a busy road than in a vaccine.

Thimerosal is NOT elemental mercury, It is a molecular compound made up of carbon, hydrogen, mercury, sodium, oxygen, and sulfur. This is used as a preservative for the vaccine. Thimerosal is used in a variety of other things, like tattoo ink, facial creams, nasal sprays. It’s toxic to humans only in fairly large quantities but highly toxic to aquatic born organisms like infectious bacteria. In short, it makes sure you don’t get salmonella from a stray bacteria from the chicken embryos.

As for the dosage of the Thimerosal. That is the most laughable point in this post. It says 25 mcg, that’s micrograms, or one millionth of a gram. To put this in perspective, a dollar bill weighs roughly 1 gram, the average human eyelash is around 80-90 micrograms. The box also says that it contains a 5ml (milliliter/cc) vial which leads me to my next point.

A little simple math and we find out that 25 mcg = 0.00003 ml and a little more math we find that 0.00003 ml is 0.00006% of 5 ml. Let me put this another way. By the age of 5, an American child weighs about 50-55lbs and their body contains 55 mcg of Uranium. I don’t see any kids running around with radiation sickness, so I think they’re safe with a preservative in them.

TL;DR: This is like saying you don’t want your child eating their baked birthday cake because raw eggs were used to make it and you don’t want your child getting salmonella from it.